Green anthraquinone dye.



' UNITED STATES Patented March 21, 1905.

PATENT OFFICE,

Rem :RT-

i or a NEW YORK.

i'br, or ELBERFELD, GERMANY, AssmNoR-ro FARBEN- 'FJABRIKEN OF'ELBERFELD. co. ,--o NEW YORK, N. Y1, A CORPORATION SPECIFICATION forming part of Letters Patent No. 785,123, dated March 21, 1905.

Application filed December 20, 1904. Serial No. 237,708.

fa. all whom it mayconcerm Be it' known bhat LHROB ERT E.-SCHMIDT.,- x-doctorof philosophy, chemist, residing at El- -berfeld, Germany, -(assignor to the FARBEN- BFA RIKEN OFEELBERFELD Co.,, of New York,) have invented a new and useful Improvement inew Anthraquinone Dyestufi'; and I hereby declare the following to be a clear and exact 1 description ofmy' invention. I ;r My invention relates to the manufacture of, I a new dyestufl" which can be obtained by treating with'forn ic aldehyde and sulfuric" acid 'd' est- 1s obtainable by heating 1-4- omoanthraquinone with cuobenzene; and'sodium acetate, bein'gfostjprobably a hydrazin of the pric fi l w wag/ r {Y 1 'V V' 7 b;

1 (I Inited States Patent No. 77 5,367 dated November 22, 1904.) v

' In carrying out my. process practically I can proceed as.,follow s, the parts being by weight: -Ten parts of the above-mentioned hydrazin obtainable from 1 4-diamido 2-3-di- ."bromoanthraquinone arejdi ssolved in two hundred parts of sulfuriclacid, (66 Baum.) To the resulting solution ten parts of a fortyper -cent. solution of formic aldehyde are slowly added onstirringaud on taking care that the temperature does not rise higher than to centigradef Itis-stirred for some hours at thistemperature until-flakes 45 of a yellowish-green color are obtained on v pouring atest portion into water. hen the reaction is thus proved to vbe complete, the -mas's is stirred into two thousand-parts of water, and the precipitate thus obtained is-filtered OE and washed with water. The newdyestuff-isthus obtainedin the shape of a dark-green paste suitable for dyeing in the vat. After being d riedand pulverized the coloring-matter forms a'greenish-black powder. It is scarcely vsoluble in boiling quinolin. and with a bluer color than the initialmaterial. It is dissolved 'byconcentrated sulfuricacid, with a yellowish-green color, yellowish green flakes" being obtained on pouring this solution into water. Upon treatment with hydrosulfite of sodium and caustic-soda lye it is transformed int'oits hydroproduct, a

- violet-blue vat being thus obtained which.

dyes cotton pu re-green fast shades.

Having now described my invention and in what manner the same is to be performed,

what I claim'as new, and desire to secure by Letters Patent, i's

The herein-described new dyestuff which can be prepared by treating with formic al-- dehyde and sulfuric acid the-product obtain;

able by heating 1-4-.diamido-2 3dibromoanthraquinone with cjupric chlorid, nitroben'zen and sodium acetate, which dy'estuff forms after being dried and pulverized a greenishblack powder soluble in concentrated sulfuric acid with a yellowish-green'color; being transformed into its hyd'rocompound on suitable reduction with hydro sulfite and caustic-soda lye," the violet-blue alkalinesolution thus obtained exhibiting the typical properties'of a:

vat"whieh dyes unmordanted cotton green shades,' substantially as 'hereinbefo're described; I

In testimony whereof Ihavesigned my name in the presence of" two subscribing witness es. i ROBERT SOHIVIID'I. I Witnesses: 1'

' O'rro 'Ko-NIG,

AHLEFELDERQI 

